Smart Thief Puzzle

Puzzle of the Day 2103 : Smart Thief Puzzle
5 second puzzle – Lateral Thinking

 A Thief enters a shop and threatens the clerk to open the safe.
The clerk says,
“The code for the safe is different every day.
If you hurt me you’ll never get the code”.
Thief manages to guess the code on his own

How did he do it, what’s the code?

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